Question

Q. If the first term of an A.P.is -7 and common difference 5. It's 18th term is​

Answer 1

Answer:

a = -7

d = 5

a18 = a + 17d = -7 + 17(5) = -7 + 85 = 78

Answer 2

Step-by-step explanation:

Given:

First term, a=-7,

Common difference, c.d=5.

n=18.

To find: 18th term.

Formula of nth term:

$an = a + (n - 1) \times d$

=> A18=-7+(18-1)×5

=> -7+17×5

=> -7+85

=> 78.